ASoC: fix compile breakage - add a missing header include

Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@gmx.de>
Acked-by: Liam Girdwood <lrg@slimlogic.co.uk>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
diff --git a/include/sound/soc-dai.h b/include/sound/soc-dai.h
index ca24e7f..061f16d 100644
--- a/include/sound/soc-dai.h
+++ b/include/sound/soc-dai.h
@@ -16,6 +16,8 @@
 
 #include <linux/list.h>
 
+#include <sound/soc.h>
+
 struct snd_pcm_substream;
 
 /*